platform/x86: thinkpad_acpi: Add support for calculator hotkey

The P52 has a keyboard which features a calculator key above the numpad.
Add support for this the calculator key (0x1313).
Signed-off-by: Benjamin Berg <bberg@redhat.com>
Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

drivers/platform/x86/thinkpad_acpi.c

@@ -1928,7 +1928,7 @@ enum {	/* hot key scan codes (derived from ACPI DSDT) */
 	/* first new observed key (star, favorites) is 0x1311 */
 	TP_ACPI_HOTKEYSCAN_STAR = 69,
 	TP_ACPI_HOTKEYSCAN_CLIPPING_TOOL2,
-	TP_ACPI_HOTKEYSCAN_UNK25,
+	TP_ACPI_HOTKEYSCAN_CALCULATOR,
 	TP_ACPI_HOTKEYSCAN_BLUETOOTH,
 	TP_ACPI_HOTKEYSCAN_KEYBOARD,
 
@@ -3449,7 +3449,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
 
 		KEY_FAVORITES,       /* Favorite app, 0x311 */
 		KEY_RESERVED,        /* Clipping tool */
-		KEY_RESERVED,
+		KEY_CALC,            /* Calculator (above numpad, P52) */
 		KEY_BLUETOOTH,       /* Bluetooth */
 		KEY_KEYBOARD         /* Keyboard, 0x315 */
 		},